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Showing 1 to 9 of 9 for “"Catch effort"”.
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Dynamic catch-effort models for the southern African hake populations
… ottt usir1g Gt1llal"1cFs method of averaging effort data. However it is riot c·lear to what extent this eqt1i 1 i bri um c:pprox itr1at i or1 approac:·h c::-ompemsates for Sl..tch errors. Col"1sequerrt ly, discrete dynamic- versions of the Schaefer and Fo>t models are fitted, i..tsi ng nor11 l …
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Catch, effort and socio-economic characteristics of the gill and beach-seine net fisheries in the Western Cape, South Africa
… were to provide quantitative estimates of total catch and effort, to assess the current and potential future importance of by-catch in the fisheries, to describe the socio-economic status of participants and to evaluate the management measures currently in effect.
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The Western Australian charter boat industry: Working towards long-term sustainability
… Unlike the other two sectors, limited catch, effort and socio-economic data exist for the charter boat industry, although more catch and effort data has been collected from the Western Australian charter boat industry since late 2001. The main objective of this study was to assess the …
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Sea trout (Salmo trutta L.) : studies of the River Twyi, South Wales
… were examined between 1988 and 1992 by sampling catches from a temporary main-river trap, and the commercial seine, commercial coracle and recreational rod fisheries. Radio tracking of adults during the spawning season investigated behavioural activities and their possible effects on stock …
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Exploitation and management of the artisanal fisheries in the Ugandan waters of Lake Victoria
… require appropriate knowledge of the fishing effort and catch statistics, as these are pertinent for evaluating the fish stocks and future prospects of the fishery. Catch assessment programmes in the Ugandan part of the lake, which should provide this type of information, collapsed in the late …
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Community-based resource use monitoring at the Olifants River Estuary
… members of the Olifants River community as catch monitors and working closely with the fishers and monitors to better understand their perceptions of the strengths and weaknesses of the monitoring system. Findings of this research suggest that despite weaknesses in the community monitoring …
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The value of catch statistics and records of Guano Harvests for managing certain South African Fisheries
… considered adequate for VPA work, viz. the catch mass and age structure, does not lead to reliable estimates of stock abundances for recent years. Use of further data related to stock adundance, such as effort data in situations where catch per unit effort is proportional to abundance, is …
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Analysis of increases in fishing power in the western rock lobster (Panulirus cygnus) fishery
… on annual stock assessments which are based on catch and effort data. This study will identify and assess the effects that changes in fishing power factors (e.g. advances in fish-finding technology) have had on estimates of catch and effort. The fishing power increases can be used to adjust …
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Assessment of early 20th Century climate model simulations of Antarctic Sea ice using historical commercial humpback whale catch data
… at a proximity to the ice edge. Humpback whale catch locations in the early 20th century corroborate with this foraging behaviour. Using humpback whale catch location data as a benchmark, the study aims to assess the skill of climate models in simulating sea ice edge location for the early 20th …